US5045292A - Process for the removal of nitric oxides from flue gases - Google Patents

Process for the removal of nitric oxides from flue gases Download PDF

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Publication number
US5045292A
US5045292A US07/630,411 US63041190A US5045292A US 5045292 A US5045292 A US 5045292A US 63041190 A US63041190 A US 63041190A US 5045292 A US5045292 A US 5045292A
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United States
Prior art keywords
liquid
flue gases
spraying
boiler
atomizing agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/630,411
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English (en)
Inventor
Hans Ruegg
Rene Vock
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Von Roll AG
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Von Roll AG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J7/00—Arrangement of devices for supplying chemicals to fire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides

Definitions

  • the invention relates to a process for the spraying of a liquid into the boiler part of an incineration plant.
  • the invention relates to a process for the removal of nitric oxides from the flue gases produced in incineration.
  • Nitric oxides are produced in the incineration of fossil fuels, domestic garbage, industrial wastes etc. For reasons of environmental protection, they cannot be discharged freely into the atmosphere.
  • the spraying-in or jetting-in of ammonia or of another suitable solution at some location or other of an incineration plant is carried out in accordance with the prior art, with so-called two-substance nozzles, i.e., with nozzles in which the atomizing agent is mixed with the liquid directly before spraying.
  • Two-substance nozzles guarantee a uniform distribution and a uniform depth of penetration of the droplets. They are used in series. In this case, each individual nozzle requires its own liquid feed and atomizing agent feed with corresponding control devices. Therefore, the procedure is very complex.
  • two-substance nozzles have relatively large dimensions, which hinders the installation into an incineration plant.
  • the equipping of already existing incineration plants with such nozzles, in order to adapt the plant to new environmental protection requirements is extremely difficult, sometimes impossible.
  • An object of the invention is to provide a process for the spraying of a liquid into the boiler part of an incineration plant which is accomplished with nozzles having a smaller space requirement than the known two-substance nozzles.
  • a smaller quantity of atomizing agent is required for a certain depth of penetration than for the fine droplets.
  • a greater depth of penetration of the droplets into the boiler part can be achieved by the process according to the invention with the same quantity of propellant.
  • the depth of penetration of the droplets into the boiler space is also increased by the fact that a larger droplet needs longer until complete evaporation and consequently has a greater lifetime and residence time.
  • the process according to the invention has a greater temperature tolerance, in particular at the upper temperature limit, than the previously known processes. Therefore, the jetting-in locations may be arranged further forward in the boiler part, where higher temperatures prevail. Temperatures of 700°-1100° C., preferably 850°-950° C., are considered as the optimum temperature range for chemical conversion with ammonia although these temperatures are not critical and higher or lower temperatures may be used.
  • the apparatus for carrying out the process according to the invention has the following features: a central feed pipe for the liquid to be sprayed, branching to the individual spray points, and a line for the gaseous pressurized atomizing agent, wherein the line for the atomizing agent opens into the central feed pipe for the liquid and the individual spray points are designed as single-substance nozzles.
  • the single-substance nozzles are essentially pipes with especially shaped end regions.
  • the end regions of the pipes may be conically tapered, so that a round jet is sprayed. They may also be designed as slit-shaped fan nozzles.
  • the same apparatus may have both round-jet nozzles and also fan nozzles.
  • the round-jet nozzles are arranged alternately with the fan nozzles.
  • shut-off devices may be provided which are designed to be operated individually or in groups, for example, on individual levels. As a result, allowance can be made for the different temperatures in the boiler part, for example when changing the material to be incinerated or the incineration conditions, by choice of the spray points.
  • ammonia solution for example, containing 25% ammonia is generally used for the process according to the invention.
  • Other substances which develop ammonia at boiler temperatures may also be used, for example, various known ammonium salts, such as ammonium carbonate, ammonium formate, ammonium oxalate or urea.
  • Compressed air or compressed steam is used as the atomizing agent which effects the creation and the transportation of the individual droplets. It is possible, for example, to operate with compressed steam in the range of about 3.5-4 bar and with compressed air in the range of about 6 bar.
  • the steam created can be condensed and the liquid collected, which may still contain unconverted reducing agent, can be further processed according to known processes or recycled in the incineration plant.
  • FIG. 1a This is a side view of a single-substance nozzle for carrying out the process according to the invention, in partially sectional representation.
  • FIG. 1b A plan view of the single-substance nozzle according to FIG. 1a.
  • FIG. 2a A side view of a further single-substance nozzle for carrying out the process according to the invention, partially in sectional representation.
  • FIG. 2b A plan view of the single-substance nozzle according to FIG. 2a.
  • FIG. 3 An arrangement of a single-substance nozzle in the boiler part of an incineration plant.
  • the single-substance nozzle 1 in FIGS. 1a and 1b designed as a round-jet nozzle, has a pipe 5 provided with an axial bore 3, at the inlet-side end 7 of which pipe a flange 9 is arranged and at the outlet-side end 11 of which a round outlet opening 13 is formed for the liquid jet being discharged into the boiler part.
  • the axial bore 3 has three regions: following the flange 9, a first, lengthy cylindrical region 15, an adjoining short region 17, narrowing conically in the direction of flow, and, adjoining that, a second cylindrical region 19. The latter is shorter than the first cylindrical region 15 and longer than the conical region 17.
  • the flange 9 adjoins a feed pipe (not shown).
  • the mixture of liquid and atomizing agent entering the single-substance nozzle 1 through the feed pipe passes through the first cylindrical region 15, is accelerated in the short conical region 17 and, after passing through the second cylindrical region 19, is discharged as a round jet consisting of many individual droplets from the round outlet opening 13 into the boiler part (not shown).
  • the single-substance nozzle 21 in FIGS. 2a and 2b designed as a fan nozzle, likewise has a pipe 5, provided with an axial bore 3, and a flange 9.
  • the first two regions 15 and 17 of the bore 3 coincide with those in FIGS. 1a and 1b.
  • the third region, i.e., the second cylindrical region, is designed as a blind bore 23.
  • the single-substance nozzle 21 ends in a gap-shaped outlet opening 25, through which the liquid enters the boiler part in a fan-shaped jet consisting of many individual droplets.
  • Round-jet nozzles and fan nozzles may be arranged in any combination, preferably alternately. It goes without saying that other nozzle shapes apart from the two shown are suitable for the process according to the invention.
  • FIG. 3 two boiler pipes 27, 29, through which a cooling medium flows and which are connected to each other by a metal plate 31, which is also referred to as a fin, are shown.
  • the metal plate 31 is penetrated by a single-substance nozzle 33, the outlet opening 35 of which protrudes into the interior 37 (not shown any further) of the boiler part.
  • the process according to the invention is used for the removal of nitric oxides (NO x ) from the flue gas which has been produced in the incineration of domestic garbage.
  • the jetting-in or the spraying-in has taken place into the combustion chamber in the so-called first pass.
  • the spraying-in can, of course, also take place at another location.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treating Waste Gases (AREA)
  • Incineration Of Waste (AREA)
  • Chimneys And Flues (AREA)
  • Catalysts (AREA)
US07/630,411 1988-09-27 1990-12-19 Process for the removal of nitric oxides from flue gases Expired - Fee Related US5045292A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH03578/88 1988-09-27
CH3578/88A CH675623A5 (da) 1988-09-27 1988-09-27

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US07412798 Continuation 1989-09-26

Publications (1)

Publication Number Publication Date
US5045292A true US5045292A (en) 1991-09-03

Family

ID=4259014

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/630,411 Expired - Fee Related US5045292A (en) 1988-09-27 1990-12-19 Process for the removal of nitric oxides from flue gases

Country Status (7)

Country Link
US (1) US5045292A (da)
EP (1) EP0364712B1 (da)
JP (1) JP2897036B2 (da)
CA (1) CA1331082C (da)
CH (1) CH675623A5 (da)
DE (1) DE58907452D1 (da)
NO (1) NO175953C (da)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5344628A (en) * 1989-10-24 1994-09-06 Martin Gmbh Fur Umwelt-Und Energietechnik Method for introducing and metering a liquid treatment medium in combustion processes
US5354544A (en) * 1993-12-27 1994-10-11 Ford Motor Company Selective reduction of nitric oxide
WO1994026659A1 (en) * 1993-05-07 1994-11-24 Nalco Fuel Tech Process and apparatus for enhancing distribution of nox-reducing chemicals in a high-solids environment
US5681536A (en) * 1996-05-07 1997-10-28 Nebraska Public Power District Injection lance for uniformly injecting anhydrous ammonia and air into a boiler cavity
US20060141408A1 (en) * 2004-12-17 2006-06-29 Clyde Bergemann Gmbh Method and apparatus for removing combustion residues using different cleaning media
US20060147362A1 (en) * 2003-02-04 2006-07-06 Kemira Oyj Catalytic process for reducing nitrogen oxides in flue gases and reducing agent composition
US20080175774A1 (en) * 2007-01-24 2008-07-24 General Electric Company Methods and systems for reducing NOx emissions in industrial combustion systems
US20090151609A1 (en) * 2007-12-15 2009-06-18 Hoskinson Gordon H Incinerator with pivoting grating system
US20130022691A1 (en) * 2010-08-03 2013-01-24 Miller J W Randolph Nitric Oxide Generation, Dilution, and Topical Application Apparatus and Method
US20150314238A1 (en) * 2012-12-21 2015-11-05 Alzchem Ag Ammonia gas generator and use of the same for reducing nitrogen oxides in exhaust gases
US10052348B2 (en) 2016-01-27 2018-08-21 Syk Technologies, Llc Nitric oxide topical application apparatus and methods
US10517817B2 (en) 2013-05-09 2019-12-31 Syk Technologies, Llc Deep topical systemic nitric oxide therapy apparatus and method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8763540B2 (en) 2008-06-23 2014-07-01 Hitachi Zosen Inova Ag Method for injecting a substance into a boiler of a waste incineration plant
EP2138766B1 (de) 2008-06-23 2016-03-30 Hitachi Zosen Inova AG Verfahren zum Eindüsen eines Stoffes in einem Kessel einer Müllverbrennungsanlage
DE102008036099B4 (de) 2008-08-04 2014-02-13 Steag Power Saar Gmbh Entstickungsanlage
DE102010050334B4 (de) * 2010-11-05 2015-04-23 Jörg Krüger Verfahren und Vorrichtung zur nicht-katalytischen Entstickung von Abgasen von Verbrennungsanlagen

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1964942A (en) * 1933-07-17 1934-07-03 William A Hallgarth Mixing device for fuel oil burners
FR1177722A (fr) * 1956-03-09 1959-04-29 Keller Spezialtechnik G M B H Procédé et dispositif de chauffage de fours, particulièrement de fours à combustibles liquides pour la cuisson de céramiques
FR2379026A1 (fr) * 1976-12-07 1978-08-25 Alentorn Ricos Sl R Installation pour le traitement de la combustion dans les foyers
US4181705A (en) * 1978-08-18 1980-01-01 Chevron Research Company Purification of fluidized-bed combustion flue gas
DE3407689A1 (de) * 1984-03-02 1985-09-12 Steag Ag, 4300 Essen Verfahren zur no(pfeil abwaerts)x(pfeil abwaerts)-minderung bei wirbelschichtfeuerungen
EP0236686A1 (en) * 1986-01-22 1987-09-16 Ishikawajima-Harima Heavy Industries Co., Ltd. Method of catalystless denitrification for fluidized bed incinerators
US4780289A (en) * 1987-05-14 1988-10-25 Fuel Tech, Inc. Process for nitrogen oxides reduction and minimization of the production of other pollutants
US4842834A (en) * 1987-02-02 1989-06-27 Fuel Tech, Inc. Process for reducing the concentration of pollutants in an effluent
WO1989007004A1 (en) * 1988-02-02 1989-08-10 Dale Gordon Jones Process and apparatus using two-stage boiler injection for reduction of oxides of nitrogen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5314664A (en) * 1976-07-27 1978-02-09 Nippon Steel Corp Method for removing nitrogen oxides contained
US4507269A (en) * 1983-11-10 1985-03-26 Exxon Research & Engineering Co. Non-catalytic method for reducing the concentration of NO in combustion effluents by injection of ammonia at temperatures greater than about 1300 degree K
JPS61268342A (ja) * 1985-05-23 1986-11-27 Mitsui Eng & Shipbuild Co Ltd 排ガス中の塩化水素濃度を制御する方法
JPS61283327A (ja) * 1985-06-07 1986-12-13 Mitsui Eng & Shipbuild Co Ltd 排ガス中の塩化水素を除去する方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1964942A (en) * 1933-07-17 1934-07-03 William A Hallgarth Mixing device for fuel oil burners
FR1177722A (fr) * 1956-03-09 1959-04-29 Keller Spezialtechnik G M B H Procédé et dispositif de chauffage de fours, particulièrement de fours à combustibles liquides pour la cuisson de céramiques
FR2379026A1 (fr) * 1976-12-07 1978-08-25 Alentorn Ricos Sl R Installation pour le traitement de la combustion dans les foyers
US4181705A (en) * 1978-08-18 1980-01-01 Chevron Research Company Purification of fluidized-bed combustion flue gas
DE3407689A1 (de) * 1984-03-02 1985-09-12 Steag Ag, 4300 Essen Verfahren zur no(pfeil abwaerts)x(pfeil abwaerts)-minderung bei wirbelschichtfeuerungen
EP0236686A1 (en) * 1986-01-22 1987-09-16 Ishikawajima-Harima Heavy Industries Co., Ltd. Method of catalystless denitrification for fluidized bed incinerators
US4842834A (en) * 1987-02-02 1989-06-27 Fuel Tech, Inc. Process for reducing the concentration of pollutants in an effluent
US4780289A (en) * 1987-05-14 1988-10-25 Fuel Tech, Inc. Process for nitrogen oxides reduction and minimization of the production of other pollutants
WO1989007004A1 (en) * 1988-02-02 1989-08-10 Dale Gordon Jones Process and apparatus using two-stage boiler injection for reduction of oxides of nitrogen

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5344628A (en) * 1989-10-24 1994-09-06 Martin Gmbh Fur Umwelt-Und Energietechnik Method for introducing and metering a liquid treatment medium in combustion processes
WO1994026659A1 (en) * 1993-05-07 1994-11-24 Nalco Fuel Tech Process and apparatus for enhancing distribution of nox-reducing chemicals in a high-solids environment
US5354544A (en) * 1993-12-27 1994-10-11 Ford Motor Company Selective reduction of nitric oxide
US5681536A (en) * 1996-05-07 1997-10-28 Nebraska Public Power District Injection lance for uniformly injecting anhydrous ammonia and air into a boiler cavity
US20060147362A1 (en) * 2003-02-04 2006-07-06 Kemira Oyj Catalytic process for reducing nitrogen oxides in flue gases and reducing agent composition
US7595034B2 (en) * 2003-02-04 2009-09-29 Kemira Oyj Catalytic process for reducing nitrogen oxides in flue gases and reducing agent composition
US20060141408A1 (en) * 2004-12-17 2006-06-29 Clyde Bergemann Gmbh Method and apparatus for removing combustion residues using different cleaning media
US7767027B2 (en) * 2004-12-17 2010-08-03 Clyde Bergemann Gmbh Method and apparatus for removing combustion residues using different cleaning media
US20080175774A1 (en) * 2007-01-24 2008-07-24 General Electric Company Methods and systems for reducing NOx emissions in industrial combustion systems
US7622091B2 (en) * 2007-01-24 2009-11-24 General Electric Company Methods and systems for reducing NOx emissions in industrial combustion systems
US20090151609A1 (en) * 2007-12-15 2009-06-18 Hoskinson Gordon H Incinerator with pivoting grating system
US8685467B2 (en) * 2010-08-03 2014-04-01 J. W. Randolph Miller Nitric oxide generation, dilution, and topical application apparatus and method
US20130022691A1 (en) * 2010-08-03 2013-01-24 Miller J W Randolph Nitric Oxide Generation, Dilution, and Topical Application Apparatus and Method
US20140314880A1 (en) * 2010-08-03 2014-10-23 Genosys, Inc. Nitric oxide generation, dilution, and topical application apparatus and method
US9302238B2 (en) * 2010-08-03 2016-04-05 Syk Technologies, Llc Nitric oxide generation, dilution, and topical application apparatus and method
US20150314238A1 (en) * 2012-12-21 2015-11-05 Alzchem Ag Ammonia gas generator and use of the same for reducing nitrogen oxides in exhaust gases
US9687783B2 (en) * 2012-12-21 2017-06-27 Alzchem Ag Ammonia gas generator and use of the same for reducing nitrogen oxides in exhaust gases
US10517817B2 (en) 2013-05-09 2019-12-31 Syk Technologies, Llc Deep topical systemic nitric oxide therapy apparatus and method
US10828249B2 (en) 2013-05-09 2020-11-10 Syk Technologies, Llc Deep topical systemic nitric oxide therapy apparatus and method
US11607382B2 (en) 2013-05-09 2023-03-21 Syk Technologies Llc Deep topical systemic nitric oxide therapy apparatus and method
US11612561B2 (en) 2013-05-09 2023-03-28 Syk Technologies, Llc Deep topical systemic nitric oxide therapy apparatus and method
US11622932B2 (en) 2013-05-09 2023-04-11 Syk Technologies Llc Deep topical systemic nitric oxide therapy apparatus and method
US11622931B2 (en) 2013-05-09 2023-04-11 Syk Technologies Llc Deep topical systemic nitric oxide therapy apparatus and method
US11638689B2 (en) 2013-05-09 2023-05-02 Syk Technologies, Llc Deep topical systemic nitric oxide therapy apparatus and method
US10052348B2 (en) 2016-01-27 2018-08-21 Syk Technologies, Llc Nitric oxide topical application apparatus and methods
US10751364B2 (en) 2016-01-27 2020-08-25 Syk Technologies, Llc Nitric oxide topical application apparatus and methods
US11304972B2 (en) 2016-01-27 2022-04-19 Syk Technologies Llc Nitric oxide topical application apparatus and methods

Also Published As

Publication number Publication date
JP2897036B2 (ja) 1999-05-31
JPH02131121A (ja) 1990-05-18
EP0364712B1 (de) 1994-04-13
NO175953B (no) 1994-09-26
NO893852D0 (no) 1989-09-27
NO175953C (no) 1995-01-04
CA1331082C (en) 1994-08-02
CH675623A5 (da) 1990-10-15
NO893852L (no) 1990-03-28
DE58907452D1 (de) 1994-05-19
EP0364712A1 (de) 1990-04-25

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